Experimental and numerical assessment of local resonance phenomena in 3D-printed acoustic metamaterials
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hdl:2117/174731
Tipus de documentArticle
Data publicació2020-04
Condicions d'accésAccés obert
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Reconeixement 4.0 Internacional
ProjecteDISEÑO COMPUTACIONAL DE METAMATERIALES ACUSTICOS Y MECANICOS (AEI-DPI2017-85521-P)
METACOUSTIC - Computational design and prototyping of acoustic metamaterials for tailored insulation of noise (EC-H2020-874481)
METACOUSTIC - Computational design and prototyping of acoustic metamaterials for tailored insulation of noise (EC-H2020-874481)
Abstract
The so called Locally Resonant Acoustic Metamaterials (LRAM) are a new kind of artificially engineered materials capable of attenuating acoustic waves. As the name suggests, this phenomenon occurs in the vicinity of internal frequencies of the material structure, and can give rise to acoustic bandgaps. One possible way to achieve this is by considering periodic arrangements of a certain topology (unit cell), smaller in size than the characteristic wavelength. In this context, a computational model based on a homogenization framework has been developed from which one can obtain the aforementioned resonance frequencies for a given LRAM unit cell design in the sub-wavelength regime, which is suitable for low-frequency applications. Aiming at validating both the proposed numerical model and the local resonance phenomena responsible for the attenuation capabilities of such materials, a 3D-printed prototype consisting of a plate with a well selected LRAM unit cell design has been built and its acoustic response to normal incident waves in the range between 500 and 2000 Hz has been tested in an impedance tube. The results demonstrate the attenuating capabilities of the proposed design in the targeted frequency range for normal incident sound pressure waves and also establish the proposed formulation as the fundamental base for the computational design of 3D-printed LRAM-based structures.
CitacióRoca, D. [et al.]. Experimental and numerical assessment of local resonance phenomena in 3D-printed acoustic metamaterials. "Journal of vibration and acoustics. Transactions of the ASME", Abril 2020, vol. 142, núm. 2, p. 021017:1-021017:19.
ISSN1048-9002
Col·leccions
- Departament d'Enginyeria mecànica - Articles de revista [594]
- Departament de Física - Articles de revista [2.173]
- Doctorat en Enginyeria Mecànica, Fluids i Aeronàutica - Articles de revista [145]
- Departament d'Enginyeria Civil i Ambiental - Articles de revista [2.986]
- LEAM - Laboratori d'Enginyeria Acústica i Mecànica - Articles de revista [59]
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